David, having given charge concerning the building of the temple, settles the method of the temple service, and orders the officers of it. When those of the same family were employed together, it would engage them to love and assist one another.
SDA Bible Commentary (limited)
Volume 1-7
21. Mahli, and Mushi. On these sons of Merari see ch.6:19, also Ex. 6:19 and Num. 3:33.